Does it matter which side (head or intake manifold), the metal exhaust crossover block off plates are installed? Should it be head, block off plate, intake gasket then intake manifold or head, intake gasket, block off plate then intake manifold?

Thanks.

 

You mean restrictor right? You probably dont want to block off the exhaust cross over because that will lead to some drivability issues. Now if your talking about the restrictor then it does matter which side you put it in and is specified in the instructions which applications used them and on which side they were used.

 

If you have headers then it doesn't matter what side has what kind of plate over the crossover holes. If you don't want the exhaust gasses to help warm up the carb then block off both holes.

With factory style exhaust manifolds, it's always been common to have the exhaust heat riser valve on the passenger side manifold. This valve is closed when the exhaust is cold and will open up once it gets warm. With the exhaust closed off or at least restricted, the exhaust gases are forced into the intake crossover. The passenger side head opening is open or restricted and the drivers side head is blocked off or restricted.

It doesn't matter which side of the gasket you put the plate on.

 

Thanks very much for the responses....it is greatly appreciated!